737 Area Code has 5 prefixes
| Prefix | Primary City | Carrier |
|---|---|---|
| 737-222 | Austin | Foremost Telecommunications Corporation - Tx |
| 737-333 | Austin | Foremost Telecommunications Corporation - Tx |
| 737-703 | Austin | Logix Communications Corporation - Tx |
| 737-704 | Austin | Grande Communications Networks, Inc. - Tx |
| 737-777 | Austin | Foremost Telecommunications Corporation - Tx |